Yes. I use protonmail in probably 95% of my emails. I personally only use my Gmail for some social media sites. Privacy is a big factor for me.
I personally use Gmail and Yahoo for sending and receiving information, but I do know of people that use Protonmail for security. I don't store anything important on my Gmail like passwords or sensitive information, and I have both 2FA and a long password on all the Gmail accounts I own for as much security as possible.
In the end, it's up to you. I've noticed Protonmail and encrypted email providers becoming more and more popular throughout the last year, but I haven't tried it yet as Gmail and Yahoo are good enough for me at the moment.
I use gmail, there's no important thing about cryptocurrency in my gmail such as password or something, mostly i store my password offline or in my phone and change the file format.
I don't want move to protonmail for now, gmail its good enough for me, since i don't get bad experience such as hacked email or something.
Using encrypted email services like Protonmail isn't necessarily because you're saving your passwords or other sensitive data/information on your email. A big advantage is also on privacy, not necessarily security. Google is a huge data miner.